Upgrade path

Metal Catwalk Bent, 2 Railings→ 4× Forged Iron →Metal Catwalk, 2 Railings

Hit a placed block with a stone axe, claw hammer or nail gun while carrying the material of the next step: 4 hits per upgrade.

Harvest drops

Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.

When it collapses

Falling, it leaves Scrap Metal Pile (60% of the time) where it lands.

Where to find (13 POIs)

Red Mesa Compound (tier 5), Shotgun Messiah Factory (tier 5), ChemTech Distribution Center (tier 4), HSP Logistics (tier 4), Joe's Junction (tier 4), Pete's Outlet (tier 4), Johnnytown (tier 3), Navezgane Creamery (tier 2), Oreally Auto (tier 2), Metal Works (tier 1), Busted Industrial Tank, Destroyed Industrial Tank, Jon's Ham Radios.

Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.